This is a pair of Taxco Mexico Art Deco style earrings. These vintage post earrings are made with 8mm cabochons and large half moon cut black onyx gems. Marked MEX CO TS-18 on one of the earring's back.
*T stands for Taxco; S stands for the artist's last name and 18 is the chronological rank of registration in the local assay office.
Dimensions: 1.125 x 1.5 x 0.75 inch